IN CELEBRITY circles in California there is a hot new way of keeping fit. It is called recess training, recess being the American word for playtime. The concept is wonderfully simple. Children burn off a fantastic number of calories by running around, so by replicating their playground games adults, too, can get great exercise, using muscle groups otherwise under-employed. Jennifer Lopez and Cindy Crawford are but two of the stars said to have fallen for - sorry, to favour - this idea, which, inevitably, has now crossed the Atlantic. Here it has been renamed circuit circus, and involves soup...